Closed shed dobby



April'Zl, 1953 H. H. sTAUBLl ETAL 2,635,644

CLOSED SHED BOBBY Filed sept. 15, V194e 2 SHEETS-SHEET 1 2.SHEETS--SHEET 2 BY Limb [wh/109er H. H. sTAuBLl Al.

CLOSED SHED BOBBY April 21, 1953 Fiied sept 15, 1948 ...All

Patented Apr. 21, 195.3

CLOSED SHED DOBBY Heinrich Hugov staubu ana Jakob Eichholzer, Horgen,Switzerland, assignors to Gebr. Staubli & Co., Horgen, Zurich,Switzerland Application September 15, 1948, Serial No. 49,314

. In Switzerland September 16, 1947 2 Claims.

In the weaving industry two systems of shedding motion are mainly inuse, namely the closed shed Jacquard machine or dobby and the open shedJacquard machine'or dobby. Most extensively used are the open shedmachines, since, being constructed as double lift machines, they allowto weave ata far higher speed. Closed shed machines havethe-characteristic, after each pick to bring all the warp threads intothe middle shed, that isclosed shed, so that at the moment of the beatup, allY the warp threads have the same tension, which Vcanonly have afavourable effect on the quality of the woven fabric. Should a closedshed machine be successfully built, which can work at the same highspeed as the open shed double lift machine, an objective aimed at for along time will have been achieved.

The object of the present invention is to build a closed shed machinewhich can run at the high speed of a modern loom. Closed shed machinesare known, in which the change of the hooks actuating the shafts orhealds takes place at the moment of the throw of the reed. At thismoment, however, there is only a very short time available for unhookingthe hooks from and hooking them on the knives, so that at a speed ofover 140 revolutions per minute the reliability with which the machinefunctions suiers. In the dobby according to the present invention theproblem of the change of the hooks at the moment of the beat up of thereed is solved i-n such a manner that the operation is also carried outon the doublelift principle, the dobby having two pairs of knives, ofwhich one actuates the even picks and the other the odd picks and whichbring the shafts pick by pick into the middle shed and from there againcarry out the shedding.

The invention will now be described with reference to the accompanyingdrawings in which Figure 1 is a diagrammatic view partially in sectionof the invention as embodied in a machine utilizing the double liftprinciple illustrating one position of the knives and a balk lever,Figure 2 is a similar diagrammatic view illustrating another position ofthe knives and balk lever, Figure 3 is an end elevation taken on line3--3 of Figure 5 and illustrating drive for the knives, Figure 4 is aview partly in section and partly in elevation taken on line 4-4 ofFigure 5, and Figure 5 is a, top plan view of the mechanism for movingthe knives.

Between the frames I each shaft lifting lever 2 is mounted so as to becapable of oscillating about a shaft 3. This shaft lifting lever 2, on

which the shafts (not shown) are suspended at Il, is connected at oneend withl an oscillating lever 5 i-n an adjustable manner. Theoscillating lever 5 is mounted so as to be capable of oscillating on ashaft B and is provided at its free end with a bearing 5' for a baulklever l. This baulk lever is provided at each of its ends with thebearings 3 and 9 constituting oating pivots for the double hooks I0 andI I. The double hooks I@ and Ii coact each with a pair of knives, thedouble hook I0 with the pair of knives I2 and the double hook II withthe pair of knives I3. A

The double hooks I0 and Il are controlled in a known manner by kmeans ofa vertical needle apparatus according to a pattern to be hooked on totheir appropriate knives of a pair and are so formed that, if a hook ishooked on a knife, the other hooked end of the double hook is raisedfrom its knife. The control' members comprise the reading needles I4 andthe transmission wires `I5 which by means of stepped rails I6 are raisedor not raised, according to whether the reading needles rest on thepattern card Il or have fallen into a hole of the pattern card Il. Thewires I5 with theirA upper ends act by means of the hook levers I8mounted loosely on a corresponding shaft between the frames I on theextension of the hooks I0 and II respectively.

As illustrated more in detail in Figures 3 to 5, the knives arereciprocable and are driven by multiple cams 24 mounted externally ofthe side frames I of the machine. The knives I3 in the upper bank orlift are reciprocated by respective lever trains generally indicated at25 and 26 and the knives in the lower lift are reciprocated by levertrains 2l and 28 respectively. The multiple cams 24 are driven by ashaft I9 operated by a suitable drive mechanism including meshingbeveled gears driven from the shaft 25. As indicated, the cam tracks aresuch that the levers 'l are held temporarily stationary when as shown inFigure 4 the upper knives I3 come together and abut the floating pivotor bearing 9.

The pairs of knives operate in the following manner:

The knives of the two pairs of knives cause the raising of the shaftsfor the even picks out of the middle shed into the upper shed and theother knife of the same pair of knives draws the shafts out of themiddle shed into the lower shed. Both knives bring the withdrawn hooksback into the position of rest. The other pair of knives actuates theshafts for the odd picks i-n exactly the same way as the pair of knivesfor the even picks. During the time interval of one pick one 3 of thepairs of knives remains in its position of rest or initial position, inwhich the control of the corresponding hooks takes place, so that thereis sufficient time available for controlling the hooks.

When the hook levers I 8 are lifted by the Wires l5, they lift the hooksof the double hooks I and H respectively from the associated knives, sothat the oppositely located hooks of the double hooks will engage at theoppositely disposed knives. The motions of the stepped rails I6 are ofcourse synchronised with the motions of the lifting knives, so thatthose vdouble hooks are controlled, the associated knives of which arein their basic position.

From the gures of the drawing it will be seen, that each pair of knivesis in the basic Ypositi'i'r'i during the operative period of the otherpair of knives and remains in that position and, for vinstance, holdsthe baulk levers 1 in their middle position during the period of onepick. For this vreason in both Figures 'l and 2 the two knives of onepair of knives are shown Vin their extreme outward position, whilst theknives of the other pair are in their basic position. y

Instead of the pairs of knives other members 'actuated from the loom byway of the dobby might be provided, which for the duration of a pickhold fast one end or the other of the baulk lever "l, during whichperiod the control of the hooks is effected.

What we claim is:

1. In a closed shed dobby, a pair of reciprocable knives for carryingout the shedding of the even picks and remaining stationary during theodd picks, a second pair of recprocable knives spaced apart from saidfirst pair, for carrying Vout the shedding of the odd picks andremaining stationary during the even picks, baulk levers, each having aiioating pivot at either end, the floating pivot on one end lbeing heldfixed While the first pair of knives is stationary. as

4 the second pair of knives rotates the baulk lever, and the floatingpivot on the opposite end being held xed while the second pair of knivesis sta-4 tionary, as the rst pair of knives rotates the baulk lever.

2. In a closed shed dobby, a first pair of reciprocalole knives forcarry-ing out the shedding of the veven picks and remaining stationarydur-l ing the odd picks, a second pair of reciprocable knives spacedapart from the said first pair for carrying out the shedding of the oddpicks and remaining stationary during the even picks,-

`baulk levers 'and respective shafts, each shaft adapted t be movedsuccessively fro-m the mid-l dle shed to lthe upper or lower shed,floating pivotsmounted at either end of each baulk lever and disposedrespectively in the path of travel of each pair of knives and betweenthe knives of each pair, the floating pivot on one end being held fixedby the rst pair of knives while stationary, as the second pair of knivesrotates the baulk lever, and therfloating -pivot on the opposite endbeing held fixed by the second pair of knives while stationary, las thefirst pair of knives rotates the baulk lever, and a lever trainconnected to each baulk lever intermediate its ends and to the shaft,for moving the shaft.

HEINRICHHHUGO SYIAUBLI. JAKOB EICHHOLZER.

